title: Sorption properties of a new thermosensitive copolymeric sorbent bearing phosphonic acid moieties in multi-component solution of cationic species.
abstract: In this paper, original thermosensitive copolymers bearing phosphonic acid groups, namely the poly(N-n-propylacrylamide-stat-2-(methacryloyloxy)methylphosphonic acid) (P(NnPAAm-stat-hMAPC1)) were synthesized, and their sorption properties for three divalent cations (Ni(2+), Ca(2+), Cd(2+)) and one trivalent cation (Al(3+)) have been investigated. The sorption experiments were performed with increasing relative amount of cationic pollution compared to the amount of sorption sites (C(n+)/P ratio) in mono and multi-component solutions to investigate the sorption mechanisms. C(n+)/P proved to strongly affect the sorption capacity and high capacities were obtained for all cations at highest C(n+)/P ratios, reaching one mole of C(sorbed)(n+) per phosphonated moiety. For divalent cations, sorption mechanisms were likely to be described by electrostatic interactions only, whereas for aluminum trivalent cation the sorption not only resulted from electrostatic interactions but also from the formation of coordination binding. The selectivity of the phosphonic acid moieties for aluminum cations was demonstrated, highlighting the interest of P(NnPAAm-stat-(h)MAPC1) for their use for the treatment of metallic pollution from wastewater.
authors.affiliation: Institut Europeen des Membranes-IEM (UMR 5635 CNRS-ENSCM-UM2) - Equipe Genie des Procedes Membranaires, Universite Montpellier II cc047, Place Eugene Bataillon, 34095 Montpellier Cedex 5, France.
authors.forename: Alain
authors.initials: A
authors.lastname: Graillot
authors.forename: Denis
authors.initials: D
authors.lastname: Bouyer
authors.forename: Sophie
authors.initials: S
authors.lastname: Monge
authors.forename: Jean-Jacques
authors.initials: JJ
authors.lastname: Robin
authors.forename: Pierre
authors.initials: P
authors.lastname: Loison
authors.forename: Catherine
authors.initials: C
authors.lastname: Faur
mesh_terms: D000327:Adsorption; D000535:Aluminum / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002413:Cations, Divalent / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010710:Phosphates / Q000737:chemistry; D010757:Phosphorous Acids / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D012996:Solutions; D055672:Static Electricity; D013997:Time Factors; D014873:Water Pollutants / Q000032:analysis / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods
chemical_list: D002413:Cations, Divalent; D010710:Phosphates; D010757:Phosphorous Acids; D011108:Polymers; D012996:Solutions; D014873:Water Pollutants; D014874:Water Pollutants, Chemical; C570063:phosphonic acid; D002244:Carbon; D000535:Aluminum
keywords: Metal sorption; Phosphonic acid; Thermosensitive copolymers